Laurie will become the new killer.
While the director's cut was the perfect ending to Zombie's vision, the producers will follow with the theatrical cut of Laurie being committed to Smith's Grove, and apparently becoming as insane as Michael.Dr. Loomis suffered serve brain damage from Michael's skull-crushing in the 2007 remake, which in-turn caused his personality to change.
It would explain why Loomis went to someone at least remotely calm to a general prick in the second film, and to someone who would snap at reporters.